{"items": [{"author": "Alex", "source_link": "https://www.facebook.com/jefftk/posts/407908155956419?comment_id=407911905956044", "anchor": "fb-407911905956044", "service": "fb", "text": ".12*100=12, not *1000. I think the ratios look right.", "timestamp": "1356364943"}, {"author": "Scott", "source_link": "https://www.facebook.com/jefftk/posts/407908155956419?comment_id=407933352620566", "anchor": "fb-407933352620566", "service": "fb", "text": "Agreed that you must normalize by passengers. However, are we now overstating the safety of commercial airplanes? What happens if we normalize by passenger-hours instead of passenger-miles? For example, if planning a vacation, I might be choosing between a 5 hour drive to somewhere within driving distance, or a 5 hour flight somewhere else in the world.", "timestamp": "1356368404"}, {"author": "Jeff Kaufman", "source_link": "https://www.facebook.com/jefftk/posts/407908155956419?comment_id=407943722619529", "anchor": "fb-407943722619529", "service": "fb", "text": "@Scott: \"I might be choosing between a 5 hour drive to somewhere within driving distance, or a 5 hour flight somewhere else in the world.\"
You're right: these aren't the right numbers for answering that question. It's not a question I usually have though. Usually I know where I want to go and then decide how to get there. But it may be much more common for other people.", "timestamp": "1356370161"}, {"author": "Richard", "source_link": "https://www.facebook.com/jefftk/posts/407908155956419?comment_id=407948102619091", "anchor": "fb-407948102619091", "service": "fb", "text": "I think Scott raises an important point. He reminded me of a lesson I prepared years ago--don't have the numbers now--that gave students safety statistics with deaths per passenger mile and included cars, planes and a rocket ship service to Pluto. The rocket to Pluto apparently had the best safety record even though, as was later revealed, everyone who had ever gone on the trip had died.", "timestamp": "1356370982"}]}